// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_AURA_EXTRA_IMAGE_WINDOW_DELEGATE_H_
#define UI_AURA_EXTRA_IMAGE_WINDOW_DELEGATE_H_

#include "base/macros.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/aura/window_delegate.h"
#include "ui/aura_extra/aura_extra_export.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/vector2d.h"
#include "ui/gfx/image/image.h"

namespace aura_extra {

// An ImageWindowDelegate paints an image for a Window, possibly also filling
// the window with a specified backround color. The delegate does not consume
// any event.
//
// The delegate destroys itself when the Window is destroyed. This is done in
// |OnWindowDestroyed()| function which subclasses can override to prevent
// self-destroying.
class AURA_EXTRA_EXPORT ImageWindowDelegate : public aura::WindowDelegate {
public:
    ImageWindowDelegate();

    void SetImage(const gfx::Image& image);

    void set_background_color(SkColor color) { background_color_ = color; }
    void set_image_offset(const gfx::Vector2d& offset) { offset_ = offset; }

    bool has_image() const { return !image_.IsEmpty(); }

protected:
    ~ImageWindowDelegate() override;

    // Overridden from aura::WindowDelegate:
    gfx::Size GetMinimumSize() const override;
    gfx::Size GetMaximumSize() const override;
    void OnBoundsChanged(const gfx::Rect& old_bounds,
        const gfx::Rect& new_bounds) override;
    gfx::NativeCursor GetCursor(const gfx::Point& point) override;
    int GetNonClientComponent(const gfx::Point& point) const override;
    bool ShouldDescendIntoChildForEventHandling(
        aura::Window* child,
        const gfx::Point& location) override;
    bool CanFocus() override;
    void OnCaptureLost() override;
    void OnPaint(const ui::PaintContext& context) override;
    void OnDeviceScaleFactorChanged(float device_scale_factor) override;
    void OnWindowDestroying(aura::Window* window) override;
    void OnWindowDestroyed(aura::Window* window) override;
    void OnWindowTargetVisibilityChanged(bool visible) override;
    bool HasHitTestMask() const override;
    void GetHitTestMask(gfx::Path* mask) const override;

protected:
    SkColor background_color_;
    gfx::Image image_;
    gfx::Vector2d offset_;

    gfx::Size window_size_;

    // Keeps track of whether the window size matches the image size or not. If
    // the image size is smaller than the window size, then the delegate fills the
    // missing regions with |background_color_| (defult is white).
    bool size_mismatch_;

    DISALLOW_COPY_AND_ASSIGN(ImageWindowDelegate);
};

} // namespace aura_extra

#endif // UI_AURA_EXTRA_IMAGE_WINDOW_DELEGATE_H_
